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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) (USD $)
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Derivative          
Change in Unrealized gains (losses) on Interest Rate Derivatives $ (65,000,000) $ 252,000,000 $ (90,000,000) $ 465,000,000  
Amount of gain (loss) recognized in income on derivatives 0   0    
Unrealized gain (loss) on derivatives 0 0 0 0  
Interest Rate Swap
          
Derivative          
Amount of gain (loss) recognized in income on derivatives 0 [1] 0 [1] 0 [1] 0 [1]  
Commodity Contract Derivatives
          
Derivative          
Amount of gain (loss) recognized in income on derivatives 0 [1] (2,000,000) [1] 0 [1] (2,000,000) [1]  
Fair value (150,000,000)   (150,000,000)   (141,000,000)
Commodity derivatives under the financial trading program
          
Derivative          
Amount of gain (loss) recognized in income on derivatives (6,000,000) [1] (21,000,000) [1] (29,000,000) [1] (99,000,000) [1]  
Fair value (90,000,000) [2]   (90,000,000) [2]   (166,000,000) [2]
Coal Contract Derivatives
          
Derivative          
Number of contracts 34   34   19
Notional amount 47,000,000   47,000,000   43,000,000
Fair value (146,000,000)   (146,000,000)   (140,000,000)
Natural gas contract derivatives
          
Derivative          
Number of contracts 33   33   13
Notional amount 63,000,000   63,000,000   39,000,000
Fair value $ (4,000,000)   $ (4,000,000)   $ (1,000,000)
Maximum | Coal Contract Derivatives
          
Derivative          
Derivative, Term of Contract     4 years    
Maximum | Natural gas contract derivatives
          
Derivative          
Derivative, Term of Contract     2 years    
[1] All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in incomebut instead are deferred as regulatory assets and liabilities. As such, there was no related gain (loss) recognized in income for these unrealized gains (losses) for the three months and nine months ended June 30, 2014 and 2013.
[2] Fair values of certain derivatives under the FTP that were in net liability positions totaling $57 million and $100 million at June 30, 2014 and September 30, 2013, respectively, are recorded in TVA's margin cash accounts in Other current assets. These derivatives are transacted with futures commission merchants, and cash deposits have been posted to the margin cash accounts held with each futures commission merchant to offset the net liability positions in full.